935 lines
26 KiB
PHP
935 lines
26 KiB
PHP
<?php
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/**
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* Project: Securimage: A PHP class for creating and managing form CAPTCHA images<br />
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* File: securimage.php<br />
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or any later version.<br /><br />
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.<br /><br />
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA<br /><br />
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*
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* Any modifications to the library should be indicated clearly in the source code
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* to inform users that the changes are not a part of the original software.<br /><br />
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*
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* If you found this script useful, please take a quick moment to rate it.<br />
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* http://www.hotscripts.com/rate/49400.html Thanks.
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*
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* @link http://www.phpcaptcha.org Securimage PHP CAPTCHA
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* @link http://www.phpcaptcha.org/latest.zip Download Latest Version
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* @link http://www.phpcaptcha.org/Securimage_Docs/ Online Documentation
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* @copyright 2007 Drew Phillips
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* @author drew010 <drew@drew-phillips.com>
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* @version 1.0.3.1 (March 24, 2008)
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* @package Securimage
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*
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*/
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/**
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ChangeLog
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1.0.3.1
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- Error reading from wordlist in some cases caused words to be cut off 1 letter short
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1.0.3
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- Removed shadow_text from code which could cause an undefined property error due to removal from previous version
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1.0.2
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- Audible CAPTCHA Code wav files
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- Create codes from a word list instead of random strings
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1.0
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- Added the ability to use a selected character set, rather than a-z0-9 only.
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- Added the multi-color text option to use different colors for each letter.
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- Switched to automatic session handling instead of using files for code storage
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- Added GD Font support if ttf support is not available. Can use internal GD fonts or load new ones.
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- Added the ability to set line thickness
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- Added option for drawing arced lines over letters
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- Added ability to choose image type for output
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*/
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/**
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* Output images in JPEG format
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*/
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define('SI_IMAGE_JPEG', 1);
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/**
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* Output images in PNG format
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*/
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define('SI_IMAGE_PNG', 2);
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/**
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* Output images in GIF format
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* Must have GD >= 2.0.28!
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*/
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define('SI_IMAGE_GIF', 3);
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/**
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* Securimage CAPTCHA Class.
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*
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* @package Securimage
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* @subpackage classes
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*
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*/
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class Securimage {
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/**
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* The desired width of the CAPTCHA image.
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*
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* @var int
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*/
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var $image_width = 175;
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/**
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* The desired width of the CAPTCHA image.
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*
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* @var int
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*/
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var $image_height = 45;
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/**
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* The image format for output.<br />
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* Valid options: SI_IMAGE_PNG, SI_IMAGE_JPG, SI_IMAGE_GIF
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*
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* @var int
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*/
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var $image_type = SI_IMAGE_PNG;
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/**
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* The length of the code to generate.
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*
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* @var int
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*/
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var $code_length = 4;
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/**
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* The character set for individual characters in the image.<br />
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* Letters are converted to uppercase.<br />
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* The font must support the letters or there may be problematic substitutions.
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*
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* @var string
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*/
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var $charset = 'ABCDEFGHKLMNPRSTUVWYZ23456789';
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//var $charset = '0123456789';
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/**
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* Create codes using this word list
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*
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* @var string The path to the word list to use for creating CAPTCHA codes
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*/
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var $wordlist_file = '../words/words.txt';
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/**
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* True to use a word list file instead of a random code
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*
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* @var bool
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*/
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var $use_wordlist = true;
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/**
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* Whether to use a GD font instead of a TTF font.<br />
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* TTF offers more support and options, but use this if your PHP doesn't support TTF.<br />
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*
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* @var boolean
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*/
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var $use_gd_font = false;
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/**
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* The GD font to use.<br />
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* Internal gd fonts can be loaded by their number.<br />
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* Alternatively, a file path can be given and the font will be loaded from file.
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*
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* @var mixed
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*/
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var $gd_font_file = 'gdfonts/bubblebath.gdf';
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/**
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* The approximate size of the font in pixels.<br />
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* This does not control the size of the font because that is determined by the GD font itself.<br />
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* This is used to aid the calculations of positioning used by this class.<br />
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*
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* @var int
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*/
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var $gd_font_size = 20;
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// Note: These font options below do not apply if you set $use_gd_font to true with the exception of $text_color
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/**
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* The path to the TTF font file to load.
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*
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* @var string
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*/
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var $ttf_file = "./elephant.ttf";
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/**
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* The font size.<br />
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* Depending on your version of GD, this should be specified as the pixel size (GD1) or point size (GD2)<br />
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*
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* @var int
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*/
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var $font_size = 24;
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/**
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* The minimum angle in degrees, with 0 degrees being left-to-right reading text.<br />
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* Higher values represent a counter-clockwise rotation.<br />
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* For example, a value of 90 would result in bottom-to-top reading text.
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*
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* @var int
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*/
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var $text_angle_minimum = -20;
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/**
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* The minimum angle in degrees, with 0 degrees being left-to-right reading text.<br />
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* Higher values represent a counter-clockwise rotation.<br />
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* For example, a value of 90 would result in bottom-to-top reading text.
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*
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* @var int
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*/
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var $text_angle_maximum = 20;
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/**
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* The X-Position on the image where letter drawing will begin.<br />
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* This value is in pixels from the left side of the image.
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*
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* @var int
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*/
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var $text_x_start = 8;
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/**
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* Letters can be spaced apart at random distances.<br />
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* This is the minimum distance between two letters.<br />
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* This should be <i>at least</i> as wide as a font character.<br />
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* Small values can cause letters to be drawn over eachother.<br />
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*
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* @var int
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*/
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var $text_minimum_distance = 30;
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/**
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* Letters can be spaced apart at random distances.<br />
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* This is the maximum distance between two letters.<br />
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* This should be <i>at least</i> as wide as a font character.<br />
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* Small values can cause letters to be drawn over eachother.<br />
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*
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* @var int
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*/
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var $text_maximum_distance = 33;
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/**
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* The background color for the image.<br />
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* This should be specified in HTML hex format.<br />
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* Make sure to include the preceding # sign!
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*
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* @var string
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*/
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var $image_bg_color = "#e3daed";
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/**
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* The text color to use for drawing characters.<br />
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* This value is ignored if $use_multi_text is set to true.<br />
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* Make sure this contrasts well with the background color.<br />
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* Specify the color in HTML hex format with preceding # sign
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*
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* @see Securimage::$use_multi_text
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* @var string
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*/
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var $text_color = "#ff0000";
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/**
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* Set to true to use multiple colors for each character.
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*
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* @see Securimage::$multi_text_color
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* @var boolean
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*/
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var $use_multi_text = true;
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/**
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* String of HTML hex colors to use.<br />
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* Separate each possible color with commas.<br />
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* Be sure to precede each value with the # sign.
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*
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* @var string
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*/
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var $multi_text_color = "#0a68dd,#f65c47,#8d32fd";
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/**
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* Set to true to make the characters appear transparent.
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*
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* @see Securimage::$text_transparency_percentage
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* @var boolean
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*/
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var $use_transparent_text = true;
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/**
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* The percentage of transparency, 0 to 100.<br />
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* A value of 0 is completely opaque, 100 is completely transparent (invisble)
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*
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* @see Securimage::$use_transparent_text
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* @var int
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*/
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var $text_transparency_percentage = 15;
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// Line options
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/**
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* Draw vertical and horizontal lines on the image.
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*
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* @see Securimage::$line_color
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* @see Securimage::$line_distance
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* @see Securimage::$line_thickness
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* @see Securimage::$draw_lines_over_text
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* @var boolean
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*/
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var $draw_lines = true;
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/**
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* The color of the lines drawn on the image.<br />
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* Use HTML hex format with preceding # sign.
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*
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* @see Securimage::$draw_lines
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* @var string
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*/
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var $line_color = "#80BFFF";
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/**
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* How far apart to space the lines from eachother in pixels.
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*
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* @see Securimage::$draw_lines
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* @var int
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*/
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var $line_distance = 5;
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/**
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* How thick to draw the lines in pixels.<br />
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* 1-3 is ideal depending on distance
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*
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* @see Securimage::$draw_lines
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* @see Securimage::$line_distance
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* @var int
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*/
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var $line_thickness = 1;
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/**
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* Set to true to draw angled lines on the image in addition to the horizontal and vertical lines.
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*
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* @see Securimage::$draw_lines
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* @var boolean
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*/
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var $draw_angled_lines = false;
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/**
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* Draw the lines over the text.<br />
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* If fales lines will be drawn before putting the text on the image.<br />
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* This can make the image hard for humans to read depending on the line thickness and distance.
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*
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* @var boolean
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*/
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var $draw_lines_over_text = false;
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/**
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* For added security, it is a good idea to draw arced lines over the letters to make it harder for bots to segment the letters.<br />
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* Two arced lines will be drawn over the text on each side of the image.<br />
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* This is currently expirimental and may be off in certain configurations.
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*
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* @var boolean
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*/
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var $arc_linethrough = true;
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/**
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* The colors or color of the arced lines.<br />
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* Use HTML hex notation with preceding # sign, and separate each value with a comma.<br />
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* This should be similar to your font color for single color images.
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*
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* @var string
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*/
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var $arc_line_colors = "#8080ff";
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/**
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* Full path to the WAV files to use to make the audio files, include trailing /.<br />
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* Name Files [A-Z0-9].wav
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*
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* @since 1.0.1
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* @var string
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*/
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var $audio_path = './audio/';
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//END USER CONFIGURATION
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//There should be no need to edit below unless you really know what you are doing.
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/**
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* The gd image resource.
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*
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* @access private
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* @var resource
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*/
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var $im;
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/**
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* The background image resource
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*
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* @access private
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* @var resource
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*/
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var $bgimg;
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/**
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* The code generated by the script
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*
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* @access private
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* @var string
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*/
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var $code;
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/**
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* The code that was entered by the user
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*
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* @access private
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* @var string
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*/
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var $code_entered;
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/**
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* Whether or not the correct code was entered
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*
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* @access private
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* @var boolean
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*/
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var $correct_code;
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/**
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* Class constructor.<br />
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* Because the class uses sessions, this will attempt to start a session if there is no previous one.<br />
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* If you do not start a session before calling the class, the constructor must be called before any
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* output is sent to the browser.
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*
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* <code>
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* $securimage = new Securimage();
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* </code>
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*
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*/
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function Securimage()
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{
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if ( session_id() == '' ) { // no session has been started yet, which is needed for validation
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session_start();
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}
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}
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/**
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* Generate a code and output the image to the browser.
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*
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* <code>
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* <?php
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* include 'securimage.php';
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* $securimage = new Securimage();
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* $securimage->show('bg.jpg');
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* ?>
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* </code>
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*
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* @param string $background_image The path to an image to use as the background for the CAPTCHA
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*/
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function show($background_image = "")
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{
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if($background_image != "" && is_readable($background_image)) {
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$this->bgimg = $background_image;
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}
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$this->doImage();
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}
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/**
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* Validate the code entered by the user.
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*
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* <code>
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* $code = $_POST['code'];
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* if ($securimage->check($code) == false) {
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* die("Sorry, the code entered did not match.");
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* } else {
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* $valid = true;
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* }
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* </code>
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* @param string $code The code the user entered
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* @return boolean true if the code was correct, false if not
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*/
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function check($code)
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{
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$this->code_entered = $code;
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$this->validate();
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return $this->correct_code;
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}
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/**
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* Generate and output the image
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*
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* @access private
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*
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*/
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function doImage()
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{
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if($this->use_transparent_text == true || $this->bgimg != "") {
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$this->im = imagecreatetruecolor($this->image_width, $this->image_height);
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$bgcolor = imagecolorallocate($this->im, hexdec(substr($this->image_bg_color, 1, 2)), hexdec(substr($this->image_bg_color, 3, 2)), hexdec(substr($this->image_bg_color, 5, 2)));
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imagefilledrectangle($this->im, 0, 0, imagesx($this->im), imagesy($this->im), $bgcolor);
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} else { //no transparency
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$this->im = imagecreate($this->image_width, $this->image_height);
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$bgcolor = imagecolorallocate($this->im, hexdec(substr($this->image_bg_color, 1, 2)), hexdec(substr($this->image_bg_color, 3, 2)), hexdec(substr($this->image_bg_color, 5, 2)));
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}
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if($this->bgimg != "") { $this->setBackground(); }
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$this->createCode();
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if (!$this->draw_lines_over_text && $this->draw_lines) $this->drawLines();
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$this->drawWord();
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if ($this->arc_linethrough == true) $this->arcLines();
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if ($this->draw_lines_over_text && $this->draw_lines) $this->drawLines();
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$this->output();
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}
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/**
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* Set the background of the CAPTCHA image
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*
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* @access private
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*
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*/
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function setBackground()
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{
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$dat = @getimagesize($this->bgimg);
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if($dat == false) { return; }
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switch($dat[2]) {
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case 1: $newim = @imagecreatefromgif($this->bgimg); break;
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case 2: $newim = @imagecreatefromjpeg($this->bgimg); break;
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case 3: $newim = @imagecreatefrompng($this->bgimg); break;
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case 15: $newim = @imagecreatefromwbmp($this->bgimg); break;
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case 16: $newim = @imagecreatefromxbm($this->bgimg); break;
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default: return;
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}
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if(!$newim) return;
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imagecopy($this->im, $newim, 0, 0, 0, 0, $this->image_width, $this->image_height);
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}
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/**
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* Draw arced lines over the text
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*
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* @access private
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*
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*/
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function arcLines()
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{
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$colors = explode(',', $this->arc_line_colors);
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imagesetthickness($this->im, 3);
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$color = $colors[rand(0, sizeof($colors) - 1)];
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$linecolor = imagecolorallocate($this->im, hexdec(substr($color, 1, 2)), hexdec(substr($color, 3, 2)), hexdec(substr($color, 5, 2)));
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$xpos = $this->text_x_start + ($this->font_size * 2) + rand(-5, 5);
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$width = $this->image_width / 2.66 + rand(3, 10);
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$height = $this->font_size * 2.14 - rand(3, 10);
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if ( rand(0,100) % 2 == 0 ) {
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$start = rand(0,66);
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$ypos = $this->image_height / 2 - rand(5, 15);
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$xpos += rand(5, 15);
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} else {
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$start = rand(180, 246);
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$ypos = $this->image_height / 2 + rand(5, 15);
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}
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$end = $start + rand(75, 110);
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imagearc($this->im, $xpos, $ypos, $width, $height, $start, $end, $linecolor);
|
|
|
|
$color = $colors[rand(0, sizeof($colors) - 1)];
|
|
$linecolor = imagecolorallocate($this->im, hexdec(substr($color, 1, 2)), hexdec(substr($color, 3, 2)), hexdec(substr($color, 5, 2)));
|
|
|
|
if ( rand(1,75) % 2 == 0 ) {
|
|
$start = rand(45, 111);
|
|
$ypos = $this->image_height / 2 - rand(5, 15);
|
|
$xpos += rand(5, 15);
|
|
} else {
|
|
$start = rand(200, 250);
|
|
$ypos = $this->image_height / 2 + rand(5, 15);
|
|
}
|
|
|
|
$end = $start + rand(75, 100);
|
|
|
|
imagearc($this->im, $this->image_width * .75, $ypos, $width, $height, $start, $end, $linecolor);
|
|
}
|
|
|
|
/**
|
|
* Draw lines on the image
|
|
*
|
|
* @access private
|
|
*
|
|
*/
|
|
function drawLines()
|
|
{
|
|
$linecolor = imagecolorallocate($this->im, hexdec(substr($this->line_color, 1, 2)), hexdec(substr($this->line_color, 3, 2)), hexdec(substr($this->line_color, 5, 2)));
|
|
imagesetthickness($this->im, $this->line_thickness);
|
|
|
|
//vertical lines
|
|
for($x = 1; $x < $this->image_width; $x += $this->line_distance) {
|
|
imageline($this->im, $x, 0, $x, $this->image_height, $linecolor);
|
|
}
|
|
|
|
//horizontal lines
|
|
for($y = 11; $y < $this->image_height; $y += $this->line_distance) {
|
|
imageline($this->im, 0, $y, $this->image_width, $y, $linecolor);
|
|
}
|
|
|
|
if ($this->draw_angled_lines == true) {
|
|
for ($x = -($this->image_height); $x < $this->image_width; $x += $this->line_distance) {
|
|
imageline($this->im, $x, 0, $x + $this->image_height, $this->image_height, $linecolor);
|
|
}
|
|
|
|
for ($x = $this->image_width + $this->image_height; $x > 0; $x -= $this->line_distance) {
|
|
imageline($this->im, $x, 0, $x - $this->image_height, $this->image_height, $linecolor);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draw the CAPTCHA code over the image
|
|
*
|
|
* @access private
|
|
*
|
|
*/
|
|
function drawWord()
|
|
{
|
|
if ($this->use_gd_font == true) {
|
|
if (!is_int($this->gd_font_file)) { //is a file name
|
|
$font = @imageloadfont($this->gd_font_file);
|
|
if ($font == false) {
|
|
trigger_error("Failed to load GD Font file {$this->gd_font_file} ", E_USER_WARNING);
|
|
return;
|
|
}
|
|
} else { //gd font identifier
|
|
$font = $this->gd_font_file;
|
|
}
|
|
|
|
$color = imagecolorallocate($this->im, hexdec(substr($this->text_color, 1, 2)), hexdec(substr($this->text_color, 3, 2)), hexdec(substr($this->text_color, 5, 2)));
|
|
imagestring($this->im, $font, $this->text_x_start, ($this->image_height / 2) - ($this->gd_font_size / 2), $this->code, $color);
|
|
|
|
} else { //ttf font
|
|
if($this->use_transparent_text == true) {
|
|
$alpha = intval($this->text_transparency_percentage / 100 * 127);
|
|
$font_color = imagecolorallocatealpha($this->im, hexdec(substr($this->text_color, 1, 2)), hexdec(substr($this->text_color, 3, 2)), hexdec(substr($this->text_color, 5, 2)), $alpha);
|
|
} else { //no transparency
|
|
$font_color = imagecolorallocate($this->im, hexdec(substr($this->text_color, 1, 2)), hexdec(substr($this->text_color, 3, 2)), hexdec(substr($this->text_color, 5, 2)));
|
|
}
|
|
|
|
$x = $this->text_x_start;
|
|
$strlen = strlen($this->code);
|
|
$y_min = ($this->image_height / 2) + ($this->font_size / 2) - 2;
|
|
$y_max = ($this->image_height / 2) + ($this->font_size / 2) + 2;
|
|
$colors = explode(',', $this->multi_text_color);
|
|
|
|
for($i = 0; $i < $strlen; ++$i) {
|
|
$angle = rand($this->text_angle_minimum, $this->text_angle_maximum);
|
|
$y = rand($y_min, $y_max);
|
|
if ($this->use_multi_text == true) {
|
|
$idx = rand(0, sizeof($colors) - 1);
|
|
$r = substr($colors[$idx], 1, 2);
|
|
$g = substr($colors[$idx], 3, 2);
|
|
$b = substr($colors[$idx], 5, 2);
|
|
if($this->use_transparent_text == true) {
|
|
$font_color = imagecolorallocatealpha($this->im, "0x$r", "0x$g", "0x$b", $alpha);
|
|
} else {
|
|
$font_color = imagecolorallocate($this->im, "0x$r", "0x$g", "0x$b");
|
|
}
|
|
}
|
|
@imagettftext($this->im, $this->font_size, $angle, $x, $y, $font_color, $this->ttf_file, $this->code{$i});
|
|
|
|
$x += rand($this->text_minimum_distance, $this->text_maximum_distance);
|
|
} //for loop
|
|
} //else ttf font
|
|
} //function
|
|
|
|
/**
|
|
* Create a code and save to the session
|
|
*
|
|
* @since 1.0.1
|
|
*
|
|
*/
|
|
function createCode()
|
|
{
|
|
$this->code = false;
|
|
|
|
if ($this->use_wordlist && is_readable($this->wordlist_file)) {
|
|
$this->code = $this->readCodeFromFile();
|
|
}
|
|
|
|
if ($this->code == false) {
|
|
$this->code = $this->generateCode($this->code_length);
|
|
}
|
|
|
|
$this->saveData();
|
|
}
|
|
|
|
/**
|
|
* Generate a code
|
|
*
|
|
* @access private
|
|
* @param int $len The code length
|
|
* @return string
|
|
*/
|
|
function generateCode($len)
|
|
{
|
|
$code = '';
|
|
|
|
for($i = 1, $cslen = strlen($this->charset); $i <= $len; ++$i) {
|
|
$code .= strtoupper( $this->charset{rand(0, $cslen - 1)} );
|
|
}
|
|
return $code;
|
|
}
|
|
|
|
/**
|
|
* Reads a word list file to get a code
|
|
*
|
|
* @access private
|
|
* @since 1.0.2
|
|
* @return mixed false on failure, a word on success
|
|
*/
|
|
function readCodeFromFile()
|
|
{
|
|
$fp = @fopen($this->wordlist_file, 'rb');
|
|
if (!$fp) return false;
|
|
|
|
$fsize = filesize($this->wordlist_file);
|
|
if ($fsize < 32) return false; // too small of a list to be effective
|
|
|
|
if ($fsize < 128) {
|
|
$max = $fsize; // still pretty small but changes the range of seeking
|
|
} else {
|
|
$max = 128;
|
|
}
|
|
|
|
fseek($fp, rand(0, $fsize - $max), SEEK_SET);
|
|
$data = fread($fp, 128); // read a random 128 bytes from file
|
|
fclose($fp);
|
|
$data = preg_replace("/\r?\n/", "\n", $data);
|
|
|
|
$start = strpos($data, "\n", rand(0, 100)) + 1; // random start position
|
|
$end = strpos($data, "\n", $start); // find end of word
|
|
|
|
return strtolower(substr($data, $start, $end - $start)); // return substring in 128 bytes
|
|
}
|
|
|
|
/**
|
|
* Output image to the browser
|
|
*
|
|
* @access private
|
|
*
|
|
*/
|
|
function output()
|
|
{
|
|
header("Expires: Sun, 1 Jan 2000 12:00:00 GMT");
|
|
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
|
|
header("Cache-Control: no-store, no-cache, must-revalidate");
|
|
header("Cache-Control: post-check=0, pre-check=0", false);
|
|
header("Pragma: no-cache");
|
|
|
|
switch($this->image_type)
|
|
{
|
|
case SI_IMAGE_JPEG:
|
|
header("Content-Type: image/jpeg");
|
|
imagejpeg($this->im, null, 90);
|
|
break;
|
|
|
|
case SI_IMAGE_GIF:
|
|
header("Content-Type: image/gif");
|
|
imagegif($this->im);
|
|
break;
|
|
|
|
default:
|
|
header("Content-Type: image/png");
|
|
imagepng($this->im);
|
|
break;
|
|
}
|
|
|
|
imagedestroy($this->im);
|
|
}
|
|
|
|
/**
|
|
* Get WAV file data of the spoken code.<br />
|
|
* This is appropriate for output to the browser as audio/x-wav
|
|
*
|
|
* @since 1.0.1
|
|
* @return string WAV data
|
|
*
|
|
*/
|
|
function getAudibleCode()
|
|
{
|
|
$letters = array();
|
|
$code = $this->getCode();
|
|
|
|
if ($code == '') {
|
|
$this->createCode();
|
|
$code = $this->getCode();
|
|
}
|
|
|
|
for($i = 0; $i < strlen($code); ++$i) {
|
|
$letters[] = $code{$i};
|
|
}
|
|
|
|
return $this->generateWAV($letters);
|
|
}
|
|
|
|
/**
|
|
* Save the code in the session
|
|
*
|
|
* @access private
|
|
*
|
|
*/
|
|
function saveData()
|
|
{
|
|
$_SESSION['securimage_code_value'] = strtolower($this->code);
|
|
}
|
|
|
|
/**
|
|
* Validate the code to the user code
|
|
*
|
|
* @access private
|
|
*
|
|
*/
|
|
function validate()
|
|
{
|
|
if ( isset($_SESSION['securimage_code_value']) && !empty($_SESSION['securimage_code_value']) ) {
|
|
if ( $_SESSION['securimage_code_value'] == strtolower(trim($this->code_entered)) ) {
|
|
$this->correct_code = true;
|
|
$_SESSION['securimage_code_value'] = '';
|
|
} else {
|
|
$this->correct_code = false;
|
|
}
|
|
} else {
|
|
$this->correct_code = false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the captcha code
|
|
*
|
|
* @since 1.0.1
|
|
* @return string
|
|
*/
|
|
function getCode()
|
|
{
|
|
if (isset($_SESSION['securimage_code_value']) && !empty($_SESSION['securimage_code_value'])) {
|
|
return $_SESSION['securimage_code_value'];
|
|
} else {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if the user entered code was correct
|
|
*
|
|
* @access private
|
|
* @return boolean
|
|
*/
|
|
function checkCode()
|
|
{
|
|
return $this->correct_code;
|
|
}
|
|
|
|
/**
|
|
* Generate a wav file by concatenating individual files
|
|
* @since 1.0.1
|
|
* @access private
|
|
* @param array $letters Array of letters to build a file from
|
|
* @return string WAV file data
|
|
*/
|
|
function generateWAV($letters)
|
|
{
|
|
$first = true; // use first file to write the header...
|
|
$data_len = 0;
|
|
$files = array();
|
|
$out_data = '';
|
|
|
|
foreach ($letters as $letter) {
|
|
$filename = $this->audio_path . strtoupper($letter) . '.wav';
|
|
|
|
$fp = fopen($filename, 'rb');
|
|
|
|
$file = array();
|
|
|
|
$data = fread($fp, filesize($filename)); // read file in
|
|
|
|
$header = substr($data, 0, 36);
|
|
$body = substr($data, 44);
|
|
|
|
|
|
$data = unpack('NChunkID/VChunkSize/NFormat/NSubChunk1ID/VSubChunk1Size/vAudioFormat/vNumChannels/VSampleRate/VByteRate/vBlockAlign/vBitsPerSample', $header);
|
|
|
|
$file['sub_chunk1_id'] = $data['SubChunk1ID'];
|
|
$file['bits_per_sample'] = $data['BitsPerSample'];
|
|
$file['channels'] = $data['NumChannels'];
|
|
$file['format'] = $data['AudioFormat'];
|
|
$file['sample_rate'] = $data['SampleRate'];
|
|
$file['size'] = $data['ChunkSize'] + 8;
|
|
$file['data'] = $body;
|
|
|
|
if ( ($p = strpos($file['data'], 'LIST')) !== false) {
|
|
// If the LIST data is not at the end of the file, this will probably break your sound file
|
|
$info = substr($file['data'], $p + 4, 8);
|
|
$data = unpack('Vlength/Vjunk', $info);
|
|
$file['data'] = substr($file['data'], 0, $p);
|
|
$file['size'] = $file['size'] - (strlen($file['data']) - $p);
|
|
}
|
|
|
|
$files[] = $file;
|
|
$data = null;
|
|
$header = null;
|
|
$body = null;
|
|
|
|
$data_len += strlen($file['data']);
|
|
|
|
fclose($fp);
|
|
}
|
|
|
|
$out_data = '';
|
|
$file_size = sizeof($files);
|
|
|
|
for($i = 0; $i < $file_size; ++$i) {
|
|
if ($i == 0) { // output header
|
|
$out_data .= pack('C4VC8', ord('R'), ord('I'), ord('F'), ord('F'), $data_len + 36, ord('W'), ord('A'), ord('V'), ord('E'), ord('f'), ord('m'), ord('t'), ord(' '));
|
|
|
|
$out_data .= pack('VvvVVvv',
|
|
16,
|
|
$files[$i]['format'],
|
|
$files[$i]['channels'],
|
|
$files[$i]['sample_rate'],
|
|
$files[$i]['sample_rate'] * (($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8),
|
|
($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8,
|
|
$files[$i]['bits_per_sample'] );
|
|
|
|
$out_data .= pack('C4', ord('d'), ord('a'), ord('t'), ord('a'));
|
|
|
|
$out_data .= pack('V', $data_len);
|
|
}
|
|
|
|
$out_data .= $files[$i]['data'];
|
|
}
|
|
|
|
return $out_data;
|
|
}
|
|
} /* class Securimage */
|
|
|
|
?>
|